Dissertations / Theses on the topic 'Digital OTA'

The constant strive for improvement of digital video capturing speeds together with power efficiency increase, has lead to tremendous research activities in the image sensor readout field during the past decade. The improvement of lithography and solid-state technologies provide the possibility of manufacturing higher resolution image sensors. A double resolution size-up, leads to a quadruple readout speed requirement, if the same capturing frame rate is to be maintained. The speed requirements of conventional serial readout techniques follow the same curve and are becoming more challenging to design, thus employing parallelism in the readout schemes appears to be inevitable for relaxing the analog readout circuits and keeping the same capturing speeds. This transfer however imposes additional demands to parallel ADC designs, mainly related to achievable accuracy, area and power. In this work a 12-bit Cyclic ADC (CADC) aimed for column-parallel readout implementation in CMOS image sensors is presented. The aim of the conducted study is to cover multiple CADC sub-component architectures and provide an analysis onto the latter to a mid-level of depth. A few various Multiplying DAC (MDAC) structures have been re-examined and a preliminary redundant signed-digit CADC design based on a 1.5-bit modified flip-over MDAC has been conducted. Three comparator architectures have been explored and a dynamic interpolative Sub-ADC is presented. Finally, some weak spots degrading the performance of the carried-out design have been analyzed. As an architectural improvement possibility two MDAC capacitor mismatch error reduction techniques have been presented.

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A demanda de novas tecnologias de transporte de dados cada vez mais velozes e com garantias de QoS (Quality of Service), ocasionadas pelo crescimento do tráfego da Internet, traz um grande desafio na área de redes de telecomunicação. As redes ópticas de transporte se apresentam como uma solução para as elevadas taxas de transmissão. No intuito de tornar as redes de núcleo mais flexíveis e ajustadas à dinamicidade e heterogeneidade das demandas, a ITU-T (International Telecommunication Union Telecommunication Standardization Sector) desenvolve uma série de recomendações abordando as mais diversas características das redes OTN (Optcial Transport Network), no contexto das redes de núcleo, determinando suas funcionalidades. Esta dissertação tem como objetivo desenvolver uma proposta de arquitetura OTN Switch, com o funcionamento da cross-conexão e da multiplexação de sinais ópticos e digitais presentes nas redes OTN. Para tal, sua arquitetura basea-se nas recomendações geradas pela ITU-T, tornando-a capaz de prover interoperabilidade com equipamentos já existentes.

Dizertační práce se zabývá elektronicky nastavitelnými oscilátory, studiem nelineárních vlastností spojených s použitými aktivními prvky a posouzením možnosti vzniku chaotického signálu v harmonických oscilátorech. Jednotlivé příklady vzniku podivných atraktorů jsou detailně diskutovány. V doktorské práci je dále prezentováno modelování reálných fyzikálních a biologických systémů vykazujících chaotické chování pomocí analogových elektronických obvodů a moderních aktivních prvků (OTA, MO-OTA, CCII ±, DVCC ±, atd.), včetně experimentálního ověření navržených struktur. Další část práce se zabývá možnostmi v oblasti analogově – digitální syntézy nelineárních dynamických systémů, studiem změny matematických modelů a odpovídajícím řešením. Na závěr je uvedena analýza vlivu a dopadu parazitních vlastností aktivních prvků z hlediska kvalitativních změn v globálním dynamickém chování jednotlivých systémů s možností zániku chaosu v důsledku parazitních vlastností použitých aktivních prvků.

The increased implementation of digital health technologies requires a better understanding of how to design technologies and services that enhance people's engagement with their health. This thesis contributes new knowledge about i) an increased understanding of the different ways in which people engage with digital health technologies, ii) the stages of people's engagement with digital health technologies over time, and iii) the features that support such engagement. The findings offer new directions for the digital health industry to further develop their service design. They also support people's engagement with their health goals through tailoring their services more effectively to end-users.

International Telemetering Conference Proceedings / October 18-21, 2004 / Town & Country Resort, San Diego, California
Hardware architecture and design details of a multi-channel GPS signal simulator with highly flexibility is presented, while the dynamic performance objectives and the requirements on the hardware architecture are discussed. The IF part of the simulator is implemented almost entirely in the digital domain by use of a field programmable gate array (FPGA), which mainly include C/A code generators, carrier generators, spreaders, and BPSK modulators. The results of testing the proposed simulator hardware architecture at IF with the help of a GPS receiver are presented.

The research described in this thesis examines indigenous language usage in a digital library environment that has been accessed via the Internet. By examining discretionary use of the Māori Niupepa and Hawaiian Nūpepa digital libraries this research investigates how indigenous languages were used in these electronic environments in 2005. The results provide encouragement and optimism to people who are striving to retain, revitalise and develop the use of indigenous languages in information technologies. The Transaction Log Analysis (TLA) methods used in this research serve as an example of how web logs can be used to provide significant information about language usage in a bilingual online information system. Combining the TLA with user feedback has provided insights into how and why clients use indigenous languages in their information retrieval activities. These insights in turn, show good practice that is relevant not only to those working with indigenous languages, indigenous peoples or multilingual environments, but to all information technology designers who strive for universal usability. This thesis begins by describing the importance of using indigenous languages in electronic environments and suggests that digital libraries can provide an environment to support and encourage the use of such languages. TLA is explained in the context of this study and is then used to analyse aspects of te reo Māori usage in the Niupepa digital library environment in 2005. TLA also indicates that te reo Māori was used by international clients and this usage differed to te reo Māori usage by national (Aotearoa) clients. Findings further reveal that the default language setting of the Niupepa digital library had a considerable impact on te reo Māori usage. When the default language was set to te reo Māori not only were there more requests in te reo Māori but there was also a higher usage of te reo Māori in the information retrieval activities. TLA of the Hawaiian Nūpepa digital library indicated that the Hawaiian language was also used in a digital library. These results confirm that indigenous languages were used in digital library environments. Feedback from clients suggests reasons why indigenous languages were used in this environment. These reasons include the indigenous language content of the digital library, the indigenous language default language setting of the digital library and a stated desire by the clients to use the indigenous language. The key findings raise some interface design issues and support the claim that digital libraries can provide an environment to support the use of indigenous languages.

This thesis is a study of a new specification for end user interactivity developed by the Open Mobile Alliance, the specification is called OMA BCAST Service Interaction Function. The specification is one part of the OMA BCAST Service Enabler, which enables service delivery to mobile devices, where the most common service is mobile television. The Service Interaction Function enables end user interactivity related to a service, this could be a poll about the current television program or a chat where every message is presented to the users that are watching the same channel.

The specification is still of draft version and the scope of this thesis has been to investigate the Service Interaction Function and implement a PC prototype.

This project proposes a new conceptual framework for the regulation of social networks and virtual communities. By applying a model based upon the rule of law, this thesis addresses the growing tensions that revolve around the public use of private networks. This research examines the shortcomings of traditional contractual governance models and cyberlaw theory and provides a reconstituted approach that will allow public constitutional-type interests to be recognised in the interpretation and enforcement of contractual doctrine.

This thesis investigates the organization culture and information culture in the archives of the Lutheran Church of Sweden. The church is the largest Christian denomination in Sweden. Since the year 2000 it is no longer a state church, though some legal, economic and even mental bonds to the state still exist. The main focus of the thesis is to investigate the influence of cultural aspects on a recent project concerning a general system for information management and digital archiving. A subsequent question is how these cultural aspects may affect the church’s future role as a cultural heritage actor. The thesis, as a framework, uses two models: one for organization culture (Granberg) and one for information culture (Choo). It combines them to a single model and connects them with Kirk’s studies on information use. Four semi-structured interviews, with archivists on national level and in two dioceses, were conducted and transcribed. In addition, related documents were studied. A qualitative analysis was carried out on the data. One conclusion made is that the general culture on national level and in the dioceses can be described as a relationship-based and professional culture. Another conclusion is that parallel cultures do exist within the church, especially in the dioceses. These parallel cultures affect the information use and information behaviour. The diminishing role of the church in the future may be the force which merges these parallel cultures into one. There are also major differences on what to count as the cultural heritage of the church. The author argues that the church should act more decisively to define its heritage and to claim its future role in the field of cultural heritage. This is a two years master’s thesis in Archival Science.

This thesis is focused on behavior of control arm opening with bushing pressed in. The tested component is a part of control arm of a car. The parts were tested in tensile and compressive strength. Real experiments were measured by optical system Aramis during the testing to determine deformations of the part. These tests are also modeled by a finite element method using an Abaqus software. In GOM Correlate software is created full-field comparison of deformation results from Aramis and FEA. Based on this comparison computational model is calibrated. Sensitivity analysis is performed at the end of the thesis.

Denna komparativa studie syftar till att besvara frågeställningen ”Hur kan procedurell retorik i digitala spel påverka förståelse för datummärkning och hållbarhet av matvaror?”. 2018 uppstod 1,3 miljoner ton matavfall i Sverige (Naturvårdsverket 2020) och Jordbruksverket (2011) presenterar bristande kunskap kring datummärkning som en stor orsak till matsvinnet. För att öka kunskapen kring problemet skapades därför två artefakter i form av digitala spel, en med procedurell retorik och en utan. Artefakterna spelades av respondenter som sedan intervjuades och resultatet påvisar ett förändrat beteende/tankesätt hos respondenter till båda spelen. Spelen verkar också fungera som en påminnelse om ämnet för respondenter som redan besatt kunskap om ämnet. Artefakten med procedurell retorik lyckades bättre i att lära ut orsakerna till att mjölk blir dålig. För att öka validiteten i resultatet skulle de båda artefakterna behöva vidareutvecklas för att bli mer snarlika och försäkra att den procedurella retoriken är den enda parametern som undersöks.

Many aspects of China's academic publishing system differ from the systems found in liberal market based economies of the United States, Western Europe and Australia. A high level of government intervention in both the publishing industry and academia and the challenges associated with attempting to make a transition from a centrally controlled towards a more market based publishing industry are two notable differences; however, as in other countries, academic communities and publishers are being transformed by digital technologies. This research explores the complex yet dynamic digital transformation of academic publishing in China, with a specific focus of the open and networked initiatives inspired by Web 2.0 and social media. The thesis draws on two case studies: Science Paper Online, a government-operated online preprint platform and open access mandate; and New Science, a social reference management website operated by a group of young PhD students. Its analysis of the innovations, business models, operating strategies, influences, and difficulties faced by these two initiatives highlights important characteristics and trends in digital publishing experiments in China. The central argument of this thesis is that the open and collaborative possibilities of Web 2.0 inspired initiatives are emerging outside the established journal and monograph publishing system in China, introducing innovative and somewhat disruptive approaches to the certification, communication and commercial exploitation of knowledge. Moreover, emerging publishing models are enabling and encouraging a new system of practising and communicating science in China, putting into practice some elements of the Open Science ethos. There is evidence of both disruptive change to old publishing structures and the adaptive modification of emergent replacements in the Chinese practice. As such, the transformation from traditional to digital and interactive modes of publishing, involves both competition and convergence between new and old publishers, as well as dynamics of co-evolution involving new technologies, business models, social norms, and government reform agendas. One key concern driving this work is whether there are new opportunities and new models for academic publishing in the Web 2.0 age and social media environment, which might allow the basic functions of communication and certification to be achieved more effectively. This thesis enriches existing knowledge of open and networked transformations of scholarly publishing by adding a Chinese story. Although the development of open and networked publishing platforms in China remains in its infancy, the lessons provided by this research are relevant to practitioners and stakeholders interested in understanding the transformative dynamics of networked technologies for publishing and advocating open access in practice, not only in China, but also internationally.

BakgrundI bakgrunden redogörs för hur datorer i undervisningen ur ett historiskt perspektiv har sett ut i Sverige från 80-talet tills idag, samt diskussioner kring ämnet datorer i undervisningen och den demokratiska betydelsen av ämnet. Skolverket har genom åren gjort diverse satsningar på IT i skolan. Trots detta har spridningen av IT har gått långsammare i skolan än i samhället i övrigt.SyfteUndersökningens syfte är att ta reda på hur ofta elever, från 7 skolklasser i åk 6, använder datorerna i skolans datorsal, samt jämföra elevernas datoranvändning mellan och inom varje skolklass.MetodUndersökningen gjordes genom enkät som är en kvantitativ metod. Då denna studie har i syfte att jämföra ett större urval elever, är en kvantitativ metod att föredra. Sammanlagt 105 elever från 7 skolklasser, samtliga i årskurs 6, medverkar i undersökningen. Enkätstudien gjordes år 2010 och utgår från elevernas egna erfarenheter.ResultatUtifrån resultatet framgår det att majoriteten av eleverna (60 %) använder datorerna i datorsalen varje vecka. 22 procent av eleverna använder datorerna varje månad eller mer sällan. 1 procent av eleverna sitter vid datorerna varje dag och 17 procent saknar tillgång till datorsal. I de flesta skolklasser har eleverna svarat att de använder datorsalens datorer varje vecka. Samtidigt uppger ett fåtal elever, i 3 skolklasser, att de använder datorerna i mindre utsträckning än deras klasskamrater. 1 skolklass har ett längre datoranvändande, där majoriteten av eleverna uppger sig sitta vid datorerna varje månad eller mer sällan.
Program: Lärarutbildningen

A Sindrome da Apneia Hipopneia obstrutiva do sono (SAHOS) é caracterizada por episódios repetidos de obstrução parcial (hipopneia) ou completa (apneia) das vias aéreas superiores durante o sono. Os efeitos clínicos da SAHOS estão relacionados aos efeitos cumulativos da exposição à asfixia periódica e à fragmentação do sono causada por apneias e hipopnéias, como o aumento do risco de hipertensão, disritmias noturnas, insuficiência ventricular, infarto do miocárdio e acidente vascular cerebral. O padrão ouro para o diagnóstico de SAHOS é a Polissonografia (PSG), na qual requer que o paciente permaneça durante a noite inteira no laboratorio de sono, conectado a diferentes sensores biológicos e sob a supervisão de um técnico. Além do desconforto causado pelos sensores invasivos, a necessidade de um ambiente clínico e infraestrutura altamente especializada resulta em uma longa lista de espera nos laboratórios do sono e altos custos, restringindo assim o acesso ao diagnóstico e tratamento. Para melhorar o monitoramento da evolução da OSA, o acesso ao diagnóstico e o acompanhamento do tratamento, propõe-se uma solução baseada em Mobile Health (mHealth) para utilizar os recursos do smartphone a fim de desenvolver uma estimativa não invasiva da gravidade da SAHOS. Utiliza-se o áudio gravado através de um smartphone para detectar automaticamente os eventos de ronco durante a noite e, através da análise desses eventos, estimar a necessidade do paciente para o tratamento de Pressão Positiva Contínua nas Vias Aéreas (CPAP). Para isso, dividimos nossa solução em duas fases: (i) uma solução completamente não supervisionada para detectar automaticamente os eventos de ronco em um ambiente não controlado e (ii) a análise das características acústicas dos eventos de ronco para estimativa de gravidade da SAHOS. Na primeira fase, podemos comprovar a viabilidade de gravar o áudio e detectar os eventos de ronco usando um smartphone em um ambiente suscetível a ruídos aleatórios. Na segunda fase, mostramos que um conjunto de características acústicas globais dos eventos de ronco pode prever a necessidade do paciente para o tratamento com CPAP. Nossa solução proposta foi avaliada em ambiente não controlado (domicílio do paciente) e controlado (laboratório do sono), atingindo resultados satisfatórios na detecção de eventos de ronco e classificação do paciente de acordo com a necessidade de tratamento com CPAP.
Obstructive Sleep Apnea (OSA) is characterized by repeated episodes of partial (hypopnea) or complete (apnea) obstruction of the upper airway during sleep. The clinical effects of OSA are related to the cumulative effects of exposure to periodic asphyxia and sleep fragmentation caused by apneas and hypopneas, such as an increased risk of hypertension, nocturnal dysrhythmias, ventricular failure, myocardial infarction, and stroke. The current gold standard for diagnosing OSA is the overnight Polysomnography (PSG), which requires a full-night sleep laboratory stay, attached to different biological sensors and under the supervision of a technician. Besides the discomfort caused by the invasive sensors, the necessity of a clinical setting and highly specialized infrastructure results in a long waiting list in sleep laboratories and high costs, thus restricting the access to diagnosis and treatment. To improve monitoring of OSA evolution, access to diagnosis and treatment follow up, we propose a Mobile Health (mHealth) solution to take advantage of the smartphone capabilities to deploy a non-invasive OSA severity estimation. We make use of the audio recorded through a smartphone to automatically detect snoring events throughout the night and through the analysis of such events estimate patient’s necessity for Continuous Positive Airway Pressure (CPAP) therapy. For that, we have divided our solution into two phases: (i) a completely unsupervised solution to automatically detect the snoring events in an uncontrolled environment and (ii) the analysis of acoustical features of the snoring events for OSA severity estimation. In the first phase, we can prove the viability of recording the audio and detect the snoring events using a smartphone under an environment susceptible to random noises. In the second phase, we show that a set of global acoustical features from the snoring events can predict the patient’s need for the CPAP therapy. Our proposed solution was evaluated in an uncontrolled (patient’s home) and controlled (sleep laboratory center) environment, reaching satisfactory results in snoring events detection and patient’s classification according to the need for CPAP therapy.

La presente investigación tiene el propósito de conocer las actitudes, comportamientos e intención de compra de los consumidores finales hacia la publicidad en redes sociales de productos farmacéuticos OTC del distrito de San Borja en Lima, Perú. El objetivo es descubrir oportunidades de mejora para el sector farmacéutico el cual no tiene una taza de crecimiento alto como otros sectores en el mercado publicitario digital. Para esto se realizó una investigación cuantitativa, la herramienta utilizada fueron encuestas a una muestra de 383 pobladores consumidores de este tipo de mercado. Además se realizó investigación cualitativa utilizando dos herramientas: Focus group o grupo de enfoque, los cuales tienen las características de la muestra objetivo de investigación y entrevistas en profundidad a expertos en los temas resaltados. Se descubrió que la intención de compra luego de impactar en el público objetivo es positiva, y la misma se ve afectada por las actitudes y el comportamiento. Las actitudes son afectadas por el contenido de los anuncios, los cuales tienen que ser informativos, creíbles y entretenidos. Estos resultados de suma importancia para el planeamiento y ejecución de plan de marketing dentro del sector farmacéutico, de manera que deberían plantear estrategias innovadoras en este rubro y poder ahorrar presupuesto utilizando el medio digital que es más económico que los medios tradicionales como televisión, radio y revistas.
The present investigation has the purpose of knowing the attitudes, behaviors and intention of purchase of the final consumers towards the publicity in social networks of pharmaceutical products OTC of the district of San Borja in Lima, Peru. The objective is to discover improvement opportunities for the pharmaceutical sector which does not have a high growth rate as other sectors in the digital advertising market. For this, a quantitative investigation was carried out, the tool used was surveys to a sample of 383 consumers of this type of market. In addition, qualitative research was carried out using two tools: Focus group, which have the characteristics of the objective sample of research and interviews with experts on the topic. It was discovered that the purchase intention after impacting the target audience is positive, and it is affected by attitudes and behavior. Attitudes are affected by the content of the ads, which have to be informative, credible and entertaining. These results are very important for the planning and execution of the marketing plan within the pharmaceutical sector, so they should propose innovative strategies in this area and be able to save budget using the digital medium that is more economical than traditional media such as television, radio and journals.
Tesis

This study has provided further understanding of the pathogenesis of EV71, one of the major etiological agents associated with significant mortality in Hand, Foot and Mouth disease. Elucidating the host-pathogen interaction and the mechanism that the virus uses to bypass host defence systems to establish infection will aid in the development of potential antiviral therapeutics against EV71.

This study takes a cultural studies approach to investigating the ways in which the articulation of vernacular creativity with digital technologies and the networked cultural public sphere might constitute sites of cultural citizenship. In the thesis, the concept of 'vernacular creativity' describes the everyday practices of material and symbolic creativity, such as storytelling and photography, that both predate digital culture and are remediated by it in particular ways. The first part of thesis, covering Chapters 2 and 3, develops a theoretical framework and cultural history of vernacular creativity in new media contexts. Chapter 2 introduces the idea of vernacular creativity and connects it to cultural studies approaches to participatory media and cultural citizenship. Chapter 3 theorises and historicises the relationships among vernacular creativity, technological innovation and new media literacy, drawing on social constructionist approaches to technology, and discussing concrete examples. The first of these examples is the mass amateurisation of photography in the first half of the twentieth century, as represented by the monopoly of popular photography by Kodak in the United States and beyond. The second is the domestication of personal computing in the second half of the twentieth century, culminating in a discussion of the Apple brand and the construction of an ideal 'creative consumer'. The second part of the thesis, covering Chapters 4 and 5, is devoted to the investigation of two major case studies drawn from contemporary new media contexts. The first of these case studies is the photosharing network flickr.com, and the second is the Digital Storytelling movement, structured around collaborative offline workshops in which participants create short multimedia works based on their biographies and personal images. These case studies are used to explore the ways vernacular creativity is being remediated in contemporary new media contexts, the socio-technical shaping of participation in digital culture, and the implications for cultural citizenship. In Chapter 6, the thesis concludes by suggesting some further implications of the research findings for cultural and media studies approaches to the relations of cultural production and the politics of popular culture.

The eyelids play an important role in lubricating and protecting the surface of the eye. Each blink serves to spread fresh tears, remove debris and replenish the smooth optical surface of the eye. Yet little is known about how the eyelids contact the ocular surface and what pressure distribution exists between the eyelids and cornea. As the principal refractive component of the eye, the cornea is a major element of the eye’s optics. The optical properties of the cornea are known to be susceptible to the pressure exerted by the eyelids. Abnormal eyelids, due to disease, have altered pressure on the ocular surface due to changes in the shape, thickness or position of the eyelids. Normal eyelids also cause corneal distortions that are most often noticed when they are resting closer to the corneal centre (for example during reading). There were many reports of monocular diplopia after reading due to corneal distortion, but prior to videokeratoscopes these localised changes could not be measured. This thesis has measured the influence of eyelid pressure on the cornea after short-term near tasks and techniques were developed to quantify eyelid pressure and its distribution. The profile of the wave-like eyelid-induced corneal changes and the refractive effects of these distortions were investigated. Corneal topography changes due to both the upper and lower eyelids were measured for four tasks involving two angles of vertical downward gaze (20° and 40°) and two near work tasks (reading and steady fixation). After examining the depth and shape of the corneal changes, conclusions were reached regarding the magnitude and distribution of upper and lower eyelid pressure for these task conditions. The degree of downward gaze appears to alter the upper eyelid pressure on the cornea, with deeper changes occurring after greater angles of downward gaze. Although the lower eyelid was further from the corneal centre in large angles of downward gaze, its effect on the cornea was greater than that of the upper eyelid. Eyelid tilt, curvature, and position were found to be influential in the magnitude of eyelid-induced corneal changes. Refractively these corneal changes are clinically and optically significant with mean spherical and astigmatic changes of about 0.25 D after only 15 minutes of downward gaze (40° reading and steady fixation conditions). Due to the magnitude of these changes, eyelid pressure in downward gaze offers a possible explanation for some of the day-to-day variation observed in refraction. Considering the magnitude of these changes and previous work on their regression, it is recommended that sustained tasks performed in downward gaze should be avoided for at least 30 minutes before corneal and refractive assessment requiring high accuracy. Novel procedures were developed to use a thin (0.17 mm) tactile piezoresistive pressure sensor mounted on a rigid contact lens to measure eyelid pressure. A hydrostatic calibration system was constructed to convert raw digital output of the sensors to actual pressure units. Conditioning the sensor prior to use regulated the measurement response and sensor output was found to stabilise about 10 seconds after loading. The influences of various external factors on sensor output were studied. While the sensor output drifted slightly over several hours, it was not significant over the measurement time of 30 seconds used for eyelid pressure, as long as the length of the calibration and measurement recordings were matched. The error associated with calibrating at room temperature but measuring at ocular surface temperature led to a very small overestimation of pressure. To optimally position the sensor-contact lens combination under the eyelid margin, an in vivo measurement apparatus was constructed. Using this system, eyelid pressure increases were observed when the upper eyelid was placed on the sensor and a significant increase was apparent when the eyelid pressure was increased by pulling the upper eyelid tighter against the eye. For a group of young adult subjects, upper eyelid pressure was measured using this piezoresistive sensor system. Three models of contact between the eyelid and ocular surface were used to calibrate the pressure readings. The first model assumed contact between the eyelid and pressure sensor over more than the pressure cell width of 1.14 mm. Using thin pressure sensitive carbon paper placed under the eyelid, a contact imprint was measured and this width used for the second model of contact. Lastly as Marx’s line has been implicated as the region of contact with the ocular surface, its width was measured and used as the region of contact for the third model. The mean eyelid pressures calculated using these three models for the group of young subjects were 3.8 ± 0.7 mmHg (whole cell), 8.0 ± 3.4 mmHg (imprint width) and 55 ± 26 mmHg (Marx’s line). The carbon imprints using Pressurex-micro confirmed previous suggestions that a band of the eyelid margin has primary contact with the ocular surface and provided the best estimate of the contact region and hence eyelid pressure. Although it is difficult to directly compare the results with previous eyelid pressure measurement attempts, the eyelid pressure calculated using this model was slightly higher than previous manometer measurements but showed good agreement with the eyelid force estimated using an eyelid tensiometer. The work described in this thesis has shown that the eyelids have a significant influence on corneal shape, even after short-term tasks (15 minutes). Instrumentation was developed using piezoresistive sensors to measure eyelid pressure. Measurements for the upper eyelid combined with estimates of the contact region between the cornea and the eyelid enabled quantification of the upper eyelid pressure for a group of young adult subjects. These techniques will allow further investigation of the interaction between the eyelids and the surface of the eye.

Approved for public release, distribution is unlimited
The purpose of this research was to introduce a Transformational Communications Architecture for the Unit Operations Center (UOC); Common Aviation Command and Control System (CAC2S); and Command and Control On-the- Move Network, Digital Over-the-Horizon Relay (CoNDOR). The methodology used was to conduct Field Tests with government contractors and private vendors in order to demonstrate the capabilities of each wireless technology researched. These wireless technologies, Free Space Optics (FSO), Microwave, 802.16, 802.11b over SecNet-11, Orthogonal Frequency Division Multiplexing (OFDM), Broadband Satellite, INMARSAT, and Iridium, all have the potential of being implemented in the transformational communications architecture for intra-nodal and inter-nodal links for UOC and CAC2S, as well as the CoNDOR communications architecture. The ultimate goal of this research was to introduce different technologies that offer more flexibility, mobility, and capability at the tactical level giving the Marine Corps the tactical wireless edge. Throughout this research, the focus revolved around testing equipment and network configurations in an IP network. Special consideration was given to wireless issues for the UOC, CAC2S, and CoNDOR, which could improve line-of-sight, beyond line-of-sight, and over-the-horizon communications for each program. These new technologies will transform communications in the United States Marine Corps for the 21st century.
Captain, United States Marine Corps

This thesis-project aims to research the possibilities of new wireless technologies in general control-situations. We have studied different existing control protocols, and developed a new protocol focusing on textbased menus. Our protocol is scaleable, easy to implement, and platform- and media independent. Since our protocol supports Plug and Play with dynamically allocated id’s, it does not require a unique id in the hardware.

To test the protocol we have developed a prototype system, consisting of a mobile phone connected to a server, which in turn is connected to two slave units, controlling peripheral equipment on 220 Volt.

The phone is an Ericsson T28, equipped with a Bluetooth unit. The server is runningthe real-time OS eCos on an ARM 7TDMI Evaluation Kit, and the slave units consist of two developer boards equipped with PIC-processors. Communication between the phone and the server is done over Bluetooth. However we did not find a working Bluetooth protocol stack ported to eCos, so a serial cable was used instead. Communication between the server and the slaves is done over a RS-485 serial network which simulates the traffic over a radio-network.

The results show that our protocol is working, and that our system would be easy to implement, cheap to produce and very scalable.

Mestrado em Sistemas de Informação
Com a ameaça imposta às operadoras por aplicações OTT como WhatsApp ou Skype, diversas iniciativas coordenadas pela GSMA foram criadas para tentar responder a este fenómeno. Paralelamente, com a evolução de tecnologias como HTML5 e WebRTC, novos serviços como o Twilio têm surgido, oferecendo APIs para o desenvolvimento de novas aplicações Web. No entanto, a integração destas tecnologias em tradicionais redes de telecomunicações não faz parte das actuais especificações. Sendo assim, o objectivo desta dissertação consiste na especificação e implementação de um protótipo baseado nestas tecnologias emergentes, integrado com uma rede IMS. Primeiramente, foi feito um estudo do estado de arte, definindo requisitos e casos de uso a serem explorados. De seguida, o desenho da solução foi feito e implementado, tendo sido criado uma plataforma que alia WebRTC e a OneAPI da GSMA (que define funcionalidades básicas para operadores), oferecendo interoperabilidade entre ambos os mundos. A solução é composta por um servidor aplicacional que expõe a API e gateway WebRTC, tendo sido testada e considerada adaptada às necessidades estabelecidas.
With the threat to operators by OTT applications such as Skype or WhatsApp, several initiatives coordinated by GSMA were created in an effort to respond to this phenomenon. In parallel, with the evolution of technologies such as HTML5 and WebRTC, new services such as Twilio are now available, offering APIs for web application development. However, the integration of these technologies and traditional telecommunication networks is not a part of the current standards. As such, the objective of this dissertation is the specification and implementation of a prototype based on these emerging technologies, integrated in an IMS network. First, a state-of-the-art analysis was made, defining requirements and use-cases to be explored. Secondly, the design and implementation of the solution was done, creating a platform that unites WebRTC and GSMA’s OneAPI (which exposes basic operator features), offering interoperability between both worlds. The solution is composed by an application server that exposes the API and a WebRTC gateway, having been successfully tested and adapted to the established needs.

Consumers of digital contents are empowered with numerous technologies allowing them to produce perfect copies of these contents and distribute them around the world with little or no cost. To prevent illegal copying and distribution, a technology called Digital Rights Management (DRM) is developed. With this technology, consumers are allowed to access digital contents only if they have purchased the corresponding licenses from license issuers. The problem, however, is that those consumers are not allowed to resell their own licenses- a restriction that goes against the first-sale doctrine. Enabling a consumer to buy a digital license directly from another consumer and allowing the two consumers to fairly exchange the license for a payment are still an open issue in DRM research area. This thesis investigates existing security solutions for achieving digital license reselling and analyses their strengths and weaknesses. The thesis then proposes a novel Reselling Deal Signing (RDS) protocol to achieve fairness in a license reselling. The idea of the protocol is to integrate the features of the concurrent signature scheme with functionalities of a License Issuer (LI). The security properties of this protocol is informally analysed and then formally verified using ATL logic and the model checker MOCHA. To assess its performance, a prototype of the RDS protocol has been developed and a comparison with related protocols has been conducted. The thesis also introduces two novel digital tokens a Reselling Permission (RP) token and a Multiple Reselling Permission (MRP) token. The RP and MRP tokens are used to show whether a given license is single and multiple resalable, respectively. Moreover, the thesis proposes two novel methods supporting fair and secure digital license reselling. The first method is the Reselling Deal (RD) method which allows a license to be resold once. This method makes use of the existing distribution infrastructure, RP, License Revocation List (LRL), and three protocols: RDS protocol RD Activation (RDA) protocol, and RD Completion (RDC) protocol. The second method is a Multiple License Reselling (MLR) method enabling one license to be resold N times by N consumers. The thesis presents two variants of the MLR method: RRP-MR (Repeated RP-based Multi-Reselling) and HC-MR (Hash Chain-based Multi-Reselling). The RRP-MR method is designed such that a buyer can choose to either continue or stop a multi-reselling of a license. Like the RD method, the RRP-MR method makes use of RP, LI, LRL, and the RDS, RDA, and RDC protocols to achieve fair and secure reselling. The HC-MR method allows multiple resellings while keeping the overhead on LI at a minimum level and enable a buyer to check how many times a license can be further resold. To do so, the HC-MR utilises MRP and the hash chain cryptographic primitive along with LRL, LI and the RDS, RDA and RDC protocols. The analysis and the evaluation of these three methods have been conducted. While supporting the license reselling, the two methods are designed to prevent a reseller from (1) continuing using a resold license, (2) reselling a non-resalable license, and (3) reselling one license a unauthorised number of times. In addition, they enable content owners of resold contents to trace a buyer who has violated any of the usage rights of a license bought from a reseller. Moreover, the methods enable a buyer to verify whether a license he is about to buy is legitimate for re-sale. Furthermore, the two methods support market power where a reseller can maximise his profit and a buyer can minimise his cost in a reselling process. In comparison with related works, our solution does not make use of any trusted hardware device, thus it is more cost-effective, while satisfying the interests of both resellers and buyers, and protecting the content owner's rights.

The multiliteracies pedagogy of the New London Group is a response to the emergence of new literacies and changing forms of meaning-making in contemporary contexts of increased cultural and linguistic diversity. This critical ethnographic research investigates the interactions between pedagogy, power, discourses, and differential access to multiliteracies, among a group of culturally and linguistically diverse learners in a mainstream Australian classroom. The study documents the way in which a teacher enacted the multiliteracies pedagogy through a series of mediabased lessons with her year six (aged 11-12 years) class. The reporting of this research is timely because the multiliteracies pedagogy has become a key feature of Australian educational policy initiatives and syllabus requirements. The methodology of this study was based on Carspecken's critical ethnography. This method includes five stages: Stage One involved eighteen days of observational data collection over the course of ten weeks in the classroom. The multiliteracies lessons aimed to enable learners to collaboratively design a claymation movie. Stage Two was the initial analysis of data, including verbatim transcribing, coding, and applying analytic tools to the data. Stage Three involved semi-structured, forty-five minute interviews with the principal, teacher, and four culturally and linguistically diverse students. In Stages Four and Five, the results of micro-level data analysis were compared with macro-level phenomena using structuration theory and extant literature about access to multiliteracies. The key finding was that students' access to multiliteracies differed among the culturally and linguistically diverse group. Existing degrees of access were reproduced, based on the learners' relation to the dominant culture. In the context of the media-based lessons in which students designed claymation movies, students from Anglo-Australian, middle-class backgrounds had greater access to transformed designing than those who were culturally marginalised. These experiences were mediated by pedagogy, power, and discourses in the classroom, which were in turn influenced by the agency of individuals. The individuals were both enabled and constrained by structures of power within the school and the wider educational and social systems. Recommendations arising from the study were provided for teachers, principals, policy makers and researchers who seek to monitor and facilitate the success of the multiliteracies pedagogy in culturally and linguistically diverse educational contexts.

This qualitative study develops a model of a virtual community for people with longterm, severe physical or mobility disabilities. The model also has implications for the wider community of people with disabilities. The study uses the Strauss and Corbin grounded theory methodology to inform the investigation from which a systematic theory has been developed. On the basis of this theory, the study proposes strategies for implementing the virtual community model. In-depth interviews were conducted with twelve Queenslanders with paraplegia, quadriplegia or other severe, long-term physical or mobility disabilities and with six health care professionals, service providers, information personnel and policy advisers involved in their well-being. The methodology used one interview question to determine their experiences and perceptions regarding virtual communities and the use of Information and Communications Technology (ICT). Each interview explored in detail the elements, enablers and barriers behind the usage of ICT and/or assistive technology. The personal responses and narratives of the people with disabilities who use the technology and their allied health care professionals were analysed and interpreted for meaning before the transcripts were returned to these participants for validation. Rich explanations were derived. Details of the various response categories of these interviews were analysed as part of the grounded theory, constant comparison methodology, and the relationship to the literature was considered. These de-constructed meanings were compared and contrasted with those in the current literature. The central theme to emerge from these narratives is that people with long-term disabilities regain a sense of control and independence in their lives through the use of ICT, as they move towards an on-line community. Other major themes that emerged from being on-line indicated that being on-line tended to break down people's isolation, while potentially changing the work paradigm (both vexed issues for people with disabilities). Information and communications technology and on-line communities offer ways to enhance every person's inclusion, participation and empowerment in our society. The primary outcome of the study is a theory regarding the character of virtual communities for people with long-term, severe mobility impairments that stakeholders may consider whenever such a virtual community is proposed. The theory is represented as a virtual community model. The model identifies the need for "a sense of control" as the foundational element of virtual communities for the disabled, and distinguishes the key domains in which disabled people participate in virtual communities. The barriers and enablers to their participation are specified within it. The model also provides a framework within which virtual communities can be facilitated. It melds six types of e-communities or sets of well-developed discrete categories (for example, themes, concepts) that the data from this study revealed: education-oriented, fantasy-oriented, information-oriented, interestoriented, relationship-oriented and transaction-oriented, depending on the type(s) of consumer need(s) to be met. The study concludes that although the technology itself provides strategies for independence and thus facilitates self-empowerment, it is also capable of being disempowering. Many interviewees referred to this aspect as a "double-edged sword". Empowerment and dis-empowerment are intersecting processes because of digital divide and information literacy issues and this "double-edged sword", which virtual reality presents for people with physical disabilities. Based on the new knowledge and the model as the outcomes of this study, a range of recommendations are discussed that have application in the community for persons with mobility impairments.

碩士
中原大學
電機工程研究所
105
None of the recently reported voltage-mode versatile filters is digitally programmable like application of easy addition of current-mode filtering signals to do the synthesis. And none of the recently reported Analytical Synthesis Methods is used for the realization of a multifunction filter. Both the above two induced motivations of researches have been merged, developed, and solved in this brief on the voltage-mode OTA-C universal biquad filter which still achieves many advantages like the employments of all sigle-ended-input OTAs, all grounded capacitors, and the least number in addition to have an controllable gain, a cascadable input terminal, and no need to impose component matchongs. To verify the theoretical analysis of the voltage-mode OTA-C universal biquad, the TSMC035 H-Spice using the 1MHz operating frequency. And this paper have 9 different simulations. Those are frequency response, power loss, Monte Carlo, sensitivity, stability, linearity and dynamic range, interactive modualation frequency, and noise and signal to noise ration.

Time-compression overlap-add (TC-OLA) is presented as a novel method of communications over a (wireless) channel, which is shown to have benefits over other methods in some applications. TC-OLA is initially explored in an experimental context using a custom wideband software-defined radio (SDR) to gain insight into some of the possibilities of this method. Basic analysis is developed showing the processing gain, transmitted spectrum, and behaviour in fading channels. The method is considered as a candidate for low power wide area network (LPWAN) applications, highlighting the equivalent channel property, channel averaging, and ability to handle more simultaneous users in the uplink than other schemes in this application area.The method is then considered as an alternative to single carrier frequency domain equalization (SC-FDE) for ultrawideband (UWB) applications, where the ability to reduce or eliminate the cyclic prefix (CP) overhead while still using frequency domain equalization (FDE) techniques is highlighted. Additional application areas for this technology are briefly considered, including cognitive radio and radar. The process of patenting this technology is outlined in an appendix. The issued patent can be found through the United States Patent and Trademark Office (USPTO) as U.S. Patent 9,479,216.
Graduate

碩士
國立成功大學
工程科學系碩博士班
97
Rapid growth of digital technology and wide availability of network access lead to digital contents getting much easier. Digital contents can be easily duplicated and have the characteristic of easy transmission. Those contents can be used, copied and spread without limit until those contents has been protected. The purpose of the development of digital rights management system is to protect digital content. But most of these systems belong to customized specifications. Different digital rights management systems are lacked of the interoperability. In this thesis, the specifications proposed by Open Mobile Alliance (OMA) are adopted to design the framework of the proposed digital right management system. The system consists of different modules for modulability. The digital content is protected via both encryption and right description. The encrypted digital content and its right object are sent to the user separated. Finally, the user must install the provided offline player for playing the digital contents.

碩士
國立交通大學
資訊學院資訊科技產業專班
96
This thesis describes a conformance and interoperability test tool for Digital Rights Management (DRM) developed on an Open Mobile Alliance (OMA) service interoperability test platform. DRM is a security (protection) mechanism that allows a content issuer to manage the media objects to be delivered to the users with copyright protection. In DRM, the users then access DRM Content (i.e., the protected media objects) according to the Rights Objects. Before a DRM application is launched for a mobile device, it is essential to conduct testing to ensure that the DRM mechanism is correctly implemented. Based on the Testing and Test Control Notation version 3 (TTCN-3) specifications, we show how DRM test cases can be efficiently implemented.

碩士
中國文化大學
資訊傳播學系
101
The popularity of mobile and digital devices leads the varied application of digital contents. Taiwanese government has encouraged the use of digital contents by financially supported projects such as National Central Library National Digital Archives Plan. The benefits and the issues of digital contents are ease to get, ease to transmit, and ease to share. On the other hand, how to prevent the misuse or protect suitable copyright is an incoming issue of digital content. When commercial behavior is involved, digital contents exchange has become more complicated. Different and unique terms might need to be applied in specific transactions. Multiple participants can also be involved in a single business transaction. Thus, a dynamic, scalable and fair trading environment is required. This research tries to understand the requirements of digital content commerce environment to build a well-fitted transaction model. Firstly, the factors of traditional (paper based) digital publishing environment are being studied to understand each role and procedures. Then, the derived factors of digital publishing can be learned. This paper shows the differences between paper-based publishing and digital publishing, and refers to the terms of OMA DRM Framework. Using the database to achieve the same specification on the Web, this research eventually creates a digital publishing environment that involves digital platform for publishers and readers. Using the concepts of web-service and cloud computing meets the network environment’s dynamic usage demand and also achieve a safe and fair trading process.

Mestrado em Relações Internacionais.
A Cibersegurança é um conceito cada vez mais presente nas agendas dos mais variados atores e instituições ao nível político dos países da Comunidade Internacional e na disciplina de Relações Internacionais (RI). Na União Europeia (UE), a problemática dos assuntos relacionados com a segurança do quinto domínio de geoestratégia –o Ciberespaço– não é recente, datando de 2001. Essas preocupações surgiram como resultado do aparecimento de ações criminosas através da utilização de meios eletrónicos nos primórdios da Internet e da Web e foram devidamente sinalizadas pela INTERPOL. Com a implosão da União Soviética e países afins, o recrudescimento do crime organizado privilegiou o Cibercrime como modo de operações preferencial, devido ao anonimato e à dificuldade de atribuição e persecução criminal, –pela natureza insegura do Ciberespaço– e ao fácil retorno de investimento (ROI). O Conselho da Europa (CdE) é a primeira instituição política europeia que deteta a situação e trabalha arduamente no sentido de enquadrar o problema através da Convenção em 2001. A UE introduz a problemática da segurança na sua agenda política muito pelo aparecimento e aceitação dessa Convenção, que constituiu um catalisador. Associado à problemática da segurança do crime eletrónico, estava a necessidade de incrementar a utilização da Sociedade de Informação e a consequente Economia de Conhecimento, como instrumentos de crescimento económico e luta contra a infoexclusão. Esta estratégia inseriu-se nas iniciativas eSociety e nos consequentes Planos de Ação de 2002, 2005 e de 2010. A criação da Agência Europeia de Segurança das Redes e da Informação (ENISA), em 2004, foi uma decisão acertada, devido à necessidade prospetiva de importância do Ciberespaço e da Internet para a UE e para o mundo. Também é com o recrudescimento do terrorismo no 09/11 (2001) e dos ataques de Madrid e de Londres que a Proteção das Infraestruturas Críticas de Informação (PIC[I]) entraram nas Agendas de Segurança da UE. No entanto, seria com os acontecimentos na Estónia (EE) em 2007, que a UE –entre outros– tomava a verdadeira consciência da problemática da segurança no Ciberespaço. Nessa altura, a UE introduz uma diferenciação positiva entre os assuntos relacionados com a eSociety e a autonomia de assuntos ligados às Redes e Sistemas de Informação (RSI) –Cibersegurança na “linguagem” da UE. A partir desta altura, a ENISA deixou de ser uma agência de pesquisa, passando a ser uma instituição de conceção e implementação de soluções de segurança para o Ciberespaço na UE, nos Estados Membros (EMs) e com instituições extracomunitárias. Com a entrada em funções da Comissão Europeia (CE) designada por "Barroso–II", começaram a ser desenvolvidos dois instrumentos importantes para as políticas do Ciberespaço da UE: A Agenda Digital e a Estratégia de Cibersegurança (ECS). Este trabalho é relacionado, mais especificamente, com o seu Pilar III da Confiança e da Segurança, daquela Agenda Digital e com as prioridades da UE-ECS. É também na vigência da mesma CE, que o Serviço Europeu de Ação Externa (SEAE) pelo Tratado de Lisboa, passou a ter maiores responsabilidades na definição e execução de ações relativas à Política Externa e de Segurança Comum (PESC) e na articulação da dimensão externa de ações da Política Comum de Segurança e Defesa (PCSD)/Política Europeia de Segurança e Defesa (PESD). Não existem mecanismos de segurança para o Ciberespaço e para a Internet completos e 100% seguros, porque aquela não é dicotómica mas sim gradativa. Ela é conseguida através de vários vetores de intervenção, nomeadamente, a Resiliência, combate ao Cibercrime e a Dissuasão. Se a ENISA tem trabalhado na primeira, será necessário desenvolver as outras. O Centro Europeu de Luta contra o Cibercrime (EC3) tentará enfrentar o segundo. Já a Agência Europeia de Defesa (AED) poderá contribuir para, potenciando sinergias, em cooperação com a Organização do Tratado do Atlântico Norte (OTAN), desenvolver a terceira, pois a OTAN há vários anos tem vindo a trabalhar na referida área e a que pertencem a grande maioria dos EMs da UE, sendo os restantes parceiros.
ABSTRACT: The Cybersecurity is increasingly present in the agendas of many actors and institutions at the political level of the International Community countries and the International Relations (IR) discipline. In the European Union (EU) those problematic issues related to the security field of the fifth domain of geostrategy –Cyberspace– is not recent. The first approach was in 2001 by the European Commission (EC). These concerns appeared as a result of the emergence of criminal activities through the use of electronic media in the early days of the Internet and the Web and were properly marked by INTERPOL. With the implosion of the Soviet Union and allied countries, the increase of organized crime privileged Cybercrime as preferred mode of operations, due to anonymity and the difficulty of attribution and criminal prosecution, -the insecure nature of cyberspace- and the easy return on "investment" (ROI). It is the Council of Europe (CoE) the first European political institution that detects the situation and work hard in order to frame the issue through a Convention in 2001. The EU introduces the issues of security in their political Agenda to quite the emergence and acceptance of the Convention who "speed-up" the political process. Associated with the issues of security of electronic crime was the need to increase the use of the Information Society and Knowledge Economy consequent as an instrument of economic growth and the fight against info-exclusion. This strategy was part of the initiatives eSociety and subsequent Action Plans 2002, 2005 and 2010.The creation of the European Network Information Security Agency (ENISA), in 2004, was a good decision, because of the need for prospective importance of Cyberspace and the Internet to the EU and to the world. Also with the increase of terrorism in 09/11 (2001) and the Madrid and London attacks which concerns on the Protection of Critical Infrastructure Information, entered the EU Security Agenda. However, it would be with the events in Estonia in 2007, the EU –among others– that take true awareness of the problem of security in cyberspace. At that time, the EU introduced a positive differentiation among related issues eSociety and autonomy of subjects related to Networks and Information Systems (NIS) –which means Cybersecurity in the "language" of the EU. Therefore ENISA is no longer a research agency it has been becoming an institution of designing and implementing security solutions for Cyberspace in the EU, the Member States (MSs) and Extra-institutions partners of the EU. With the entry into force of the EC called "Barroso II", two important EU Cyberspace policy instruments began to be developed: The Digital Agenda and the Cyber Security Strategy (CSS). With regard to this work in particular, relates more specifically with the Pillar III of Trust and Security of the Digital Agenda and connections of the UE-CSS and Common Foreign and Security Policy (CFSP). Concerning to this EC, that the European External Action Service (EEAS) by the Treaty of Lisbon, came to have greater responsibilities in defining and implementing actions related to CFSP and the articulation of foreign shares dimension of Common Security and Defence Policy (CSDP) - formally, the European Security and Defence Policy (ESDP). There are no security mechanisms for Cyberspace and the Internet to be complete and 100% secure, because this is not dichotomous but rather gradual. It is achieved through various vectors of intervention, namely the Resilience, fight for Cybercrime and Deterrence. If ENISA, has worked in the first, will be necessary also to develop mechanisms in the others. The European Cybercrime Center will fight the second. The European Defence Agency (EDA), among others, may contribute also to this effect, leveraging synergies in cooperation with North Atlantic Treaty Organization (NATO), which for several years has been working in that area and they are part of the vast majority MSs of the EU, remaining the rest as partners.

Práctica Profesional Supervisada (Licenciada en Bibliotecología y Documentación) -- Universidad Nacional de Córdoba. Facultad de Filosofía y Humanidades, 2017
El presente Informe ha sido elaborado a partir de la intervención llevada a cabo en la Oficina de Conocimiento Abierto, dependiente del Campus Virtual de la Gerencia General de la Universidad Nacional de Córdoba en el período comprendido entre los años 2015 y 2016. La misma fue realizada en el marco de la propuesta de Práctica Profesional Supervisada (PPS) de la carrera Licenciatura en Bibliotecología y Documentación que se dicta en la Escuela de Bibliotecología, Facultad de Filosofía y Humanidades de la UNC con el fin de obtener mi título de grado. El Reglamento de Escuela describe a esta práctica como una actividad formativa del alumno, la cual se desarrolla como un proceso personal e individual de acciones de investigación-acción relacionadas con tareas profesionales que incumben a las competencias del licenciado en Bibliotecología y Documentación; y también como una experiencia de aprendizaje referida a la intervención profesional y de producción intelectual dentro de la especialidad. Las mismas pueden ser realizadas en instituciones públicas o privadas que ofrezcan programas, proyectos o tareas que se vinculen a la gestión de la información. De esta manera, surge un vínculo bidireccional en el que teoría y práctica se complementan mutuamente dando lugar a un nuevo sentido y significado de la realidad profesional; abarca una experiencia multidimensional centrada en conocer en la práctica, entendida como aprendizaje en función de una interacción entre experiencia y competencia” (Universidad Panamericana de Guatemala, 2013, p.2). Realizar una PPS ha sido para mí una nueva experiencia y un gran desafío, dado que no existen antecedentes en la Escuela de Bibliotecología de trabajos bajo esta modalidad. La elección ha radicado en el deseo de realizar un aporte concreto a la visibilidad de la Oficina de Conocimiento Abierto, a través de herramientas comunicacionales, promocionales y formativas, con la firme intención que la experiencia no se convierta en una abstracción teórica o una mera recopilación informativa, conformado sólo de relatos sino que la misma represente un aprendizaje concreto adquirido en el mismo proceso. El proceso de formación académica transitado me permitió reflexionar sobre el sentido de responsabilidad que implica la función del bibliotecario como difusor del conocimiento asegurando las condiciones para su accesibilidad, difusión democrática y preservación digital en el tiempo. Siguiendo pautas generales de presentación de PPS, se aborda en primera instancia la contextualización de la intervención y los objetivos propuestos acompañado del marco conceptual introductorio al mundo del acceso abierto a la información que dará sustento a la práctica. Se continúa con el diagnóstico de la institución que dio origen a los objetivos, incluyendo antecedentes, y posteriormente se describe la intervención prevista para desarrollar las actividades y productos proyectados.

The performance of existing ground-based space debris laser ranging systems can be improved by directing more light onto space debris by coherently combining multiple lasers using an optical phased array (OPA). If the power delivered to target is sufficiently high then these systems may also provide the capability to remotely manoeuvre space debris via photon radiation pressure and/or ablation. By stabilising the relative output phase of multiple lasers, OPAs form a coherent optical wave-front in the far field. Since the phase of each laser can be controlled independently, they also have the ability to dynamically manipulate the distribution of optical power in the far field, potentially enabling them to compensate for atmospheric turbulence. This beam-forming functionality, combined with their inherent scalability and high power handling capabilities make OPAs a promising technology for future space debris laser ranging and manoeuvring systems. In this thesis, we describe the iterative development of a high-power compatible internally sensed OPA, which---in contrast to externally sensed OPAs that sense the output phase of each laser externally using free-space optics---relies on the small fraction of light that is reflected back into the fibre at the output of the OPA to stabilise its relative output phase. This allows internally sensed OPAs to be implemented entirely within fibre without any dependence on free-space optics at the output, offering potential advantages over externally sensed techniques when operating in the presence of shock and vibration. A proof-of-concept experiment demonstrated the viability of internal sensing, but also highlighted a number of weaknesses that would affect its utility, specifically in supporting high optical powers greater than 100s of mW. An improved high-power compatible internally sensed OPA was designed to overcome these restrictions by isolating sensitive optical components from high optical powers using asymmetric fibre couplers. This concept was initially demonstrated experimentally using slave lasers offset phase-locked to a single master laser, and then again using fibre amplifiers in a master oscillator power amplifier configuration. The experimental demonstration of the fibre amplifier compatible OPA stabilised the relative output phase of three commercial 15 W fibre amplifiers, demonstrating a root-mean-squared output phase stability of $\lambda/194$, and the ability to steer the beam at up to 10 kHz. The internally sensed OPA presented here requires the simultaneous measurement, and control of the phase of each emitter in the OPA. This is accomplished using digitally enhanced heterodyne interferometry and digitally implemented phasemeters, both of which rely heavily on high-speed digital signal processing resources provided by field-programmable gate-arrays.